For those interested I made this conversion myself on a Land Rover 101 using a 4BD2TC,a NV4500 transmission and a Land Rover Discovery II transfer case. As there seemed to be no suitable adapters available and my company (ROAMERDRIVE) has access to a foundry we made a batch of the castings and machined them up. The conversion is not for the faint hearted as there is very little space for the motor but it all works very well. And a few people have purchased the castings since - mostly for application in Land Rover 110s.
The front casting requires no machining but you need the ISUZU flywheel and Pressure plate and use the Dodge 12" clutch with a Jeep clutch fork and external cylinder. The rear adapter also needs no machining ad uses the 29 spline exit shaft and includes an adapter shaft to fit the 230 transfer case. As we have one of our own 1:1.28 overdrives fitted my experience is that the 1:2 ratio transfer case is a bit high so we plan to exchange it for a Defender 1:4. The 101s Drum brakes are a bit pathetic so we have upgraded to vented GMC 13" dics on all four wheels.
Our ISUZU came out of a running truck but we overhauled it anyway using an offshore block lit and a replacement head from an outfit in California.
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